The lug insert is designed to swivel within it's seat in the lug casing to accommodate a certain degree of tension rod splay.
It doesn't cause any tuning issues or damage to the drum.

If you like the Ludwig kit then you should buy it and enjoy it to the fullest.
Ludwig drums are not the only drums that have some tension rod splay.
If you want you can add a double lug gasket to bring the lug out from the shell a slight bit.
I personally think that it would be a waste of time and money to do so. :)

I own a modern Black Beauty that has no lug gaskets. There is a slight degree of splay.
It is one of my favorite snare drums and I sometimes can't wait to get home from work to play it.
I also have a vintage Gretsch Cob snare that has some splay. Another beautiful drum that I have cherished for almost 40 years.